Pioneers is a faithful Gtk2 translation of the
excellent board game "Settlers of Catan", with
server-client multiplayer, computer players, and
support for the changes made in the Seafarers of
Catan expansion to the original board game.

KAlarm lets you schedule personal messages to display, audio files to play, commands to execute, or emails to send. Among its options, it allows you to choose the message font and color, recurrence schedule, whether to display an advance reminder, whether to speak the message or play a sound when it is displayed, and whether to cancel the alarm if it can't be triggered on time (e.g. if you are logged out at the time). As well as using the graphical interface to configure alarms, you can use the command line, and there is a D-Bus/DCOP interface for other applications.

Trac is a minimalistic but highly useful issue tracker and
software project environment based around an integrated Wiki
engine. Features include an interface to Subversion (source
revision control), a bug/issue tracking database, and
convenient report facilities.

MuseScore lets you notate and compose music easily with your keyboard, your mouse, or a MIDI keyboard. You can print beautifully engraved sheet music or export it as PDF or PNG. You can play your score, transpose it, and save it as audio or MIDI file. MuseScore also supports MusicXML to let you share your composition with other scorewriters. MuseScore is often advertised as a cost effective alternative for Sibelius and Finale.

Dabo is a three-tier, cross-platform database
application development framework, written in
Python with the wxPython GUI toolkit. The controls
in Dabo's UI are easily bound to data by setting
two properties. The business object is designed to
afford you complete control over the validation
and handling of your data. The cursor classes are
abstracted from their backend implementations,
allowing for easy support of nearly any backend
database. Dabo's design and approach has been
inspired by RAD database development tools such as
Visual FoxPro, Delphi, and Visual Basic.

Internet DJ console is a graphical shoutcast/icecast client that runs under GTK+ and the JACK audio connection kit. In short, it's an Internet radio app for making a live radio show or podcast. Features include two main media players with a crossfader, a jingle player, microphone signal processing (compressor and noise gate), IRC track announcements with X-Chat, an automatic stream shut-off timer, MP3 or Ogg streaming and recording at various bit rates, aux input for connecting external JACK aware applications, and audio level meters.

NetCrack is cluster software developed to distribute a hashing algorithm's cracking process work using a brute force attack. Currently, it only supports the two most commonly used hashing algorithms: MD5 and SHA-1. Support is included for MySQL, safe mode, and others. It works like a client/server application, where the server is unique for each cluster network and its job is to distribute the cracking process work, coordinate the nodes, and prevent connections and data integrity errors.

httpico is yet another lightweight HTTP server. It implements a few HTML rewriting rules delineated by '<?pico>' tags, and makes it fairly easy to add more straight into the C code. It does not have complete HTTP standards compliance. It also contains a 'genstats' log analysis tool.

RedStore is a lightweight RDF triplestore written in C using the Redland library. It features SPARQL over HTTP support, an HTTP interface that is compatible with 4store, and unit tests for most of the HTTP server code.
The only build dependancy is Redland.